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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Noordin, N.K. Ali, B.M. Jamuar, S.S. Ismail, M.B. |
| Copyright Year | 2008 |
| Description | Author affiliation: Dept. of Electr., Univ. Kebangsaan Malaysia, Bangi (Ismail, M.B.) || Fac. of Eng., Univ. Putra Malaysia, Serdang (Noordin, N.K.; Ali, B.M.; Jamuar, S.S.) |
| Abstract | Transmit diversity in orthogonal frequency division multiplexing (OFDM) has gained a lot of interest recently due to its ability to transform frequency selective fading into multiple flat fadings. In this paper we investigate 2 transmit and 1 receive (2Tx:1Rx) space-time OFDM (ST-OFDM) and space-frequency OFDM (SF-OFDM) systems in conjunction with convolutional precoding as a redundancy method to combat channel impairments. We built our ST and SF-OFDM on top of our coded OFDM (COFDM) with convolutional coding of rate 1/4 and constraint length of 10. We simulated our ST-OFDM and SF-OFDM over a multipath fading channel using Naftali 802.11 channel model under various delay spreads in relation to outdoor environment. SF-OFDM show a slight performance improvement under these conditions as compared to ST-OFDM by as much as 3 dB signal to noise ratio (SNR) requirement for the same BER of $10^{-4}$ for a delay spread of 1.5 microseconds. We also compare our precoded ST-OFDM and SF-OFDM against conventional single carrier OFDM and COFDM systems as well as Alamoutipsilas space time block code (STBC) system. |
| Sponsorship | IEEE Region 10 |
| Starting Page | 1 |
| Ending Page | 6 |
| File Size | 1027389 |
| Page Count | 6 |
| File Format | |
| ISBN | 9781424424085 |
| DOI | 10.1109/TENCON.2008.4766476 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2008-11-19 |
| Publisher Place | India |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | OFDM Fading Convolutional codes Convolution Delay Digital video broadcasting Frequency diversity Signal to noise ratio Radio transmitters Employment space-frequency and convolutional coding transmit diversity fading channels space-time |
| Content Type | Text |
| Resource Type | Article |
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